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NetBSD/sys/netinet/in.h

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/* $NetBSD: in.h,v 1.114 2021/02/03 18:13:13 roy Exp $ */
/*
* Copyright (c) 1982, 1986, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)in.h 8.3 (Berkeley) 1/3/94
*/
/*
* Constants and structures defined by the internet system,
* Per RFC 790, September 1981, and numerous additions.
*/
#ifndef _NETINET_IN_H_
#define _NETINET_IN_H_
#include <sys/featuretest.h>
#include <machine/int_types.h>
#ifndef _BSD_UINT8_T_
typedef __uint8_t uint8_t;
#define _BSD_UINT8_T_
#endif
#ifndef _BSD_UINT32_T_
typedef __uint32_t uint32_t;
#define _BSD_UINT32_T_
#endif
#include <sys/ansi.h>
#ifndef in_addr_t
typedef __in_addr_t in_addr_t;
#define in_addr_t __in_addr_t
#endif
#ifndef in_port_t
typedef __in_port_t in_port_t;
#define in_port_t __in_port_t
#endif
#ifndef sa_family_t
typedef __sa_family_t sa_family_t;
#define sa_family_t __sa_family_t
#endif
/*
* Protocols
*/
#define IPPROTO_IP 0 /* dummy for IP */
#define IPPROTO_HOPOPTS 0 /* IP6 hop-by-hop options */
#define IPPROTO_ICMP 1 /* control message protocol */
#define IPPROTO_IGMP 2 /* group mgmt protocol */
#define IPPROTO_GGP 3 /* gateway^2 (deprecated) */
#define IPPROTO_IPV4 4 /* IP header */
#define IPPROTO_IPIP 4 /* IP inside IP */
#define IPPROTO_TCP 6 /* tcp */
#define IPPROTO_EGP 8 /* exterior gateway protocol */
#define IPPROTO_PUP 12 /* pup */
#define IPPROTO_UDP 17 /* user datagram protocol */
#define IPPROTO_IDP 22 /* xns idp */
#define IPPROTO_TP 29 /* tp-4 w/ class negotiation */
#define IPPROTO_DCCP 33 /* DCCP */
#define IPPROTO_IPV6 41 /* IP6 header */
#define IPPROTO_ROUTING 43 /* IP6 routing header */
#define IPPROTO_FRAGMENT 44 /* IP6 fragmentation header */
#define IPPROTO_RSVP 46 /* resource reservation */
#define IPPROTO_GRE 47 /* GRE encaps RFC 1701 */
#define IPPROTO_ESP 50 /* encap. security payload */
#define IPPROTO_AH 51 /* authentication header */
#define IPPROTO_MOBILE 55 /* IP Mobility RFC 2004 */
#define IPPROTO_IPV6_ICMP 58 /* IPv6 ICMP */
#define IPPROTO_ICMPV6 58 /* ICMP6 */
#define IPPROTO_NONE 59 /* IP6 no next header */
#define IPPROTO_DSTOPTS 60 /* IP6 destination option */
#define IPPROTO_EON 80 /* ISO cnlp */
#define IPPROTO_ETHERIP 97 /* Ethernet-in-IP */
#define IPPROTO_ENCAP 98 /* encapsulation header */
#define IPPROTO_PIM 103 /* Protocol indep. multicast */
#define IPPROTO_IPCOMP 108 /* IP Payload Comp. Protocol */
#define IPPROTO_VRRP 112 /* VRRP RFC 2338 */
#define IPPROTO_CARP 112 /* Common Address Resolution Protocol */
#define IPPROTO_L2TP 115 /* L2TPv3 */
#define IPPROTO_SCTP 132 /* SCTP */
#define IPPROTO_PFSYNC 240 /* PFSYNC */
#define IPPROTO_RAW 255 /* raw IP packet */
#define IPPROTO_MAX 256
/* last return value of *_input(), meaning "all job for this pkt is done". */
#define IPPROTO_DONE 257
/* sysctl placeholder for (FAST_)IPSEC */
#define CTL_IPPROTO_IPSEC 258
/*
* Local port number conventions:
*
* Ports < IPPORT_RESERVED are reserved for privileged processes (e.g. root),
* unless a kernel is compiled with IPNOPRIVPORTS defined.
*
* When a user does a bind(2) or connect(2) with a port number of zero,
* a non-conflicting local port address is chosen.
*
* The default range is IPPORT_ANONMIN to IPPORT_ANONMAX, although
* that is settable by sysctl(3); net.inet.ip.anonportmin and
* net.inet.ip.anonportmax respectively.
*
* A user may set the IPPROTO_IP option IP_PORTRANGE to change this
* default assignment range.
*
* The value IP_PORTRANGE_DEFAULT causes the default behavior.
*
* The value IP_PORTRANGE_HIGH is the same as IP_PORTRANGE_DEFAULT,
* and exists only for FreeBSD compatibility purposes.
*
* The value IP_PORTRANGE_LOW changes the range to the "low" are
* that is (by convention) restricted to privileged processes.
* This convention is based on "vouchsafe" principles only.
* It is only secure if you trust the remote host to restrict these ports.
* The range is IPPORT_RESERVEDMIN to IPPORT_RESERVEDMAX.
*/
#define IPPORT_RESERVED 1024
#define IPPORT_ANONMIN 49152
#define IPPORT_ANONMAX 65535
#define IPPORT_RESERVEDMIN 600
#define IPPORT_RESERVEDMAX (IPPORT_RESERVED-1)
/*
* Internet address (a structure for historical reasons)
*/
struct in_addr {
in_addr_t s_addr;
};
#ifdef __CTASSERT
__CTASSERT(sizeof(struct in_addr) == 4);
#endif
/*
* Definitions of bits in internet address integers.
* On subnets, the decomposition of addresses to host and net parts
* is done according to subnet mask, not the masks here.
*
* By byte-swapping the constants, we avoid ever having to byte-swap IP
* addresses inside the kernel. Unfortunately, user-level programs rely
* on these macros not doing byte-swapping.
*/
#ifdef _KERNEL
#define __IPADDR(x) ((uint32_t) htonl((uint32_t)(x)))
#else
#define __IPADDR(x) ((uint32_t)(x))
#endif
#define IN_CLASSA(i) (((uint32_t)(i) & __IPADDR(0x80000000)) == \
__IPADDR(0x00000000))
#define IN_CLASSA_NET __IPADDR(0xff000000)
#define IN_CLASSA_NSHIFT 24
#define IN_CLASSA_HOST __IPADDR(0x00ffffff)
#define IN_CLASSA_MAX 128
#define IN_CLASSB(i) (((uint32_t)(i) & __IPADDR(0xc0000000)) == \
__IPADDR(0x80000000))
#define IN_CLASSB_NET __IPADDR(0xffff0000)
#define IN_CLASSB_NSHIFT 16
#define IN_CLASSB_HOST __IPADDR(0x0000ffff)
#define IN_CLASSB_MAX 65536
#define IN_CLASSC(i) (((uint32_t)(i) & __IPADDR(0xe0000000)) == \
__IPADDR(0xc0000000))
#define IN_CLASSC_NET __IPADDR(0xffffff00)
#define IN_CLASSC_NSHIFT 8
#define IN_CLASSC_HOST __IPADDR(0x000000ff)
#define IN_CLASSD(i) (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
__IPADDR(0xe0000000))
/* These ones aren't really net and host fields, but routing needn't know. */
#define IN_CLASSD_NET __IPADDR(0xf0000000)
#define IN_CLASSD_NSHIFT 28
#define IN_CLASSD_HOST __IPADDR(0x0fffffff)
#define IN_MULTICAST(i) IN_CLASSD(i)
#define IN_EXPERIMENTAL(i) (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
__IPADDR(0xf0000000))
#define IN_BADCLASS(i) (((uint32_t)(i) & __IPADDR(0xf0000000)) == \
__IPADDR(0xf0000000))
#define IN_LINKLOCAL(i) (((uint32_t)(i) & __IPADDR(0xffff0000)) == \
__IPADDR(0xa9fe0000))
#define IN_PRIVATE(i) ((((uint32_t)(i) & __IPADDR(0xff000000)) == \
__IPADDR(0x0a000000)) || \
(((uint32_t)(i) & __IPADDR(0xfff00000)) == \
__IPADDR(0xac100000)) || \
(((uint32_t)(i) & __IPADDR(0xffff0000)) == \
__IPADDR(0xc0a80000)))
#define IN_LOCAL_GROUP(i) (((uint32_t)(i) & __IPADDR(0xffffff00)) == \
__IPADDR(0xe0000000))
#define IN_ANY_LOCAL(i) (IN_LINKLOCAL(i) || IN_LOCAL_GROUP(i))
#define INADDR_ANY __IPADDR(0x00000000)
#define INADDR_LOOPBACK __IPADDR(0x7f000001)
#define INADDR_BROADCAST __IPADDR(0xffffffff) /* must be masked */
#define INADDR_NONE __IPADDR(0xffffffff) /* -1 return */
#define INADDR_UNSPEC_GROUP __IPADDR(0xe0000000) /* 224.0.0.0 */
#define INADDR_ALLHOSTS_GROUP __IPADDR(0xe0000001) /* 224.0.0.1 */
#define INADDR_ALLRTRS_GROUP __IPADDR(0xe0000002) /* 224.0.0.2 */
#define INADDR_CARP_GROUP __IPADDR(0xe0000012) /* 224.0.0.18 */
#define INADDR_MAX_LOCAL_GROUP __IPADDR(0xe00000ff) /* 224.0.0.255 */
#define IN_LOOPBACKNET 127 /* official! */
#define IN_RFC3021_MASK __IPADDR(0xfffffffe)
/*
* Socket address, internet style.
*/
struct sockaddr_in {
uint8_t sin_len;
sa_family_t sin_family;
in_port_t sin_port;
struct in_addr sin_addr;
__int8_t sin_zero[8];
};
#define INET_ADDRSTRLEN 16
/*
* Structure used to describe IP options.
* Used to store options internally, to pass them to a process,
* or to restore options retrieved earlier.
* The ip_dst is used for the first-hop gateway when using a source route
* (this gets put into the header proper).
*/
struct ip_opts {
struct in_addr ip_dst; /* first hop, 0 w/o src rt */
#if defined(__cplusplus)
__int8_t Ip_opts[40]; /* actually variable in size */
#else
__int8_t ip_opts[40]; /* actually variable in size */
#endif
};
/*
* Options for use with [gs]etsockopt at the IP level.
* First word of comment is data type; bool is stored in int.
*/
#define IP_OPTIONS 1 /* buf/ip_opts; set/get IP options */
#define IP_HDRINCL 2 /* int; header is included with data */
#define IP_TOS 3 /* int; IP type of service and preced. */
#define IP_TTL 4 /* int; IP time to live */
#define IP_RECVOPTS 5 /* bool; receive all IP opts w/dgram */
#define IP_RECVRETOPTS 6 /* bool; receive IP opts for response */
#define IP_RECVDSTADDR 7 /* bool; receive IP dst addr w/dgram */
#define IP_RETOPTS 8 /* ip_opts; set/get IP options */
#define IP_MULTICAST_IF 9 /* in_addr; set/get IP multicast i/f */
#define IP_MULTICAST_TTL 10 /* u_char; set/get IP multicast ttl */
#define IP_MULTICAST_LOOP 11 /* u_char; set/get IP multicast loopback */
/* The add and drop membership option numbers need to match with the v6 ones */
#define IP_ADD_MEMBERSHIP 12 /* ip_mreq; add an IP group membership */
#define IP_DROP_MEMBERSHIP 13 /* ip_mreq; drop an IP group membership */
#define IP_PORTALGO 18 /* int; port selection algo (rfc6056) */
#define IP_PORTRANGE 19 /* int; range to use for ephemeral port */
#define IP_RECVIF 20 /* bool; receive reception if w/dgram */
#define IP_ERRORMTU 21 /* int; get MTU of last xmit = EMSGSIZE */
#define IP_IPSEC_POLICY 22 /* struct; get/set security policy */
#define IP_RECVTTL 23 /* bool; receive IP TTL w/dgram */
#define IP_MINTTL 24 /* minimum TTL for packet or drop */
#define IP_PKTINFO 25 /* struct; set default src if/addr */
#define IP_RECVPKTINFO 26 /* int; receive dst if/addr w/dgram */
#define IP_BINDANY 27 /* bool: allow bind to any address */
#define IP_SENDSRCADDR IP_RECVDSTADDR /* FreeBSD compatibility */
/*
* Information sent in the control message of a datagram socket for
* IP_PKTINFO and IP_RECVPKTINFO.
*/
struct in_pktinfo {
struct in_addr ipi_addr; /* src/dst address */
unsigned int ipi_ifindex; /* interface index */
};
#define ipi_spec_dst ipi_addr /* Solaris/Linux compatibility */
/*
* Defaults and limits for options
*/
#define IP_DEFAULT_MULTICAST_TTL 1 /* normally limit m'casts to 1 hop */
#define IP_DEFAULT_MULTICAST_LOOP 1 /* normally hear sends if a member */
#define IP_MAX_MEMBERSHIPS 20 /* per socket; must fit in one mbuf */
/*
* Argument structure for IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP.
*/
struct ip_mreq {
struct in_addr imr_multiaddr; /* IP multicast address of group */
struct in_addr imr_interface; /* local IP address of interface */
};
/*
* Argument for IP_PORTRANGE:
* - which range to search when port is unspecified at bind() or connect()
*/
#define IP_PORTRANGE_DEFAULT 0 /* default range */
#define IP_PORTRANGE_HIGH 1 /* same as DEFAULT (FreeBSD compat) */
#define IP_PORTRANGE_LOW 2 /* use privileged range */
#if defined(_NETBSD_SOURCE)
/*
* Definitions for inet sysctl operations.
*
* Third level is protocol number.
* Fourth level is desired variable within that protocol.
*/
/*
* Names for IP sysctl objects
*/
#define IPCTL_FORWARDING 1 /* act as router */
#define IPCTL_SENDREDIRECTS 2 /* may send redirects when forwarding */
#define IPCTL_DEFTTL 3 /* default TTL */
/* IPCTL_DEFMTU=4, never implemented */
#define IPCTL_FORWSRCRT 5 /* forward source-routed packets */
#define IPCTL_DIRECTEDBCAST 6 /* default broadcast behavior */
#define IPCTL_ALLOWSRCRT 7 /* allow/drop all source-routed pkts */
#define IPCTL_SUBNETSARELOCAL 8 /* treat subnets as local addresses */
#define IPCTL_MTUDISC 9 /* allow path MTU discovery */
#define IPCTL_ANONPORTMIN 10 /* minimum ephemeral port */
#define IPCTL_ANONPORTMAX 11 /* maximum ephemeral port */
#define IPCTL_MTUDISCTIMEOUT 12 /* allow path MTU discovery */
#define IPCTL_MAXFLOWS 13 /* maximum ip flows allowed */
#define IPCTL_HOSTZEROBROADCAST 14 /* is host zero a broadcast addr? */
#define IPCTL_GIF_TTL 15 /* default TTL for gif encap packet */
#define IPCTL_LOWPORTMIN 16 /* minimum reserved port */
#define IPCTL_LOWPORTMAX 17 /* maximum reserved port */
#define IPCTL_MAXFRAGPACKETS 18 /* max packets reassembly queue */
#define IPCTL_GRE_TTL 19 /* default TTL for gre encap packet */
#define IPCTL_CHECKINTERFACE 20 /* drop pkts in from 'wrong' iface */
#define IPCTL_IFQ 21 /* IP packet input queue */
#define IPCTL_RANDOMID 22 /* use random IP ids (if configured) */
#define IPCTL_LOOPBACKCKSUM 23 /* do IP checksum on loopback */
#define IPCTL_STATS 24 /* IP statistics */
#define IPCTL_DAD_COUNT 25 /* DAD packets to send */
#endif /* _NETBSD_SOURCE */
/* INET6 stuff */
#define __KAME_NETINET_IN_H_INCLUDED_
#include <netinet6/in6.h>
#undef __KAME_NETINET_IN_H_INCLUDED_
#ifdef _KERNEL
#include <sys/psref.h>
/*
* in_cksum_phdr:
*
* Compute significant parts of the IPv4 checksum pseudo-header
* for use in a delayed TCP/UDP checksum calculation.
*
* Args:
*
* src Source IP address
* dst Destination IP address
* lenproto htons(proto-hdr-len + proto-number)
*/
static __inline u_int16_t __unused
in_cksum_phdr(u_int32_t src, u_int32_t dst, u_int32_t lenproto)
{
u_int32_t sum;
sum = lenproto +
(u_int16_t)(src >> 16) +
(u_int16_t)(src /*& 0xffff*/) +
(u_int16_t)(dst >> 16) +
(u_int16_t)(dst /*& 0xffff*/);
sum = (u_int16_t)(sum >> 16) + (u_int16_t)(sum /*& 0xffff*/);
if (sum > 0xffff)
sum -= 0xffff;
return (sum);
}
/*
* in_cksum_addword:
*
* Add the two 16-bit network-order values, carry, and return.
*/
static __inline u_int16_t __unused
in_cksum_addword(u_int16_t a, u_int16_t b)
{
u_int32_t sum = a + b;
if (sum > 0xffff)
sum -= 0xffff;
return (sum);
}
extern struct in_addr zeroin_addr;
extern u_char ip_protox[];
extern const struct sockaddr_in in_any;
int in_broadcast(struct in_addr, struct ifnet *);
int in_direct(struct in_addr, struct ifnet *);
int in_canforward(struct in_addr);
int cpu_in_cksum(struct mbuf *, int, int, uint32_t);
int in_cksum(struct mbuf *, int);
int in4_cksum(struct mbuf *, u_int8_t, int, int);
int in_localaddr(struct in_addr);
void in_socktrim(struct sockaddr_in *);
void in_len2mask(struct in_addr *, u_int);
void in_if_link_up(struct ifnet *);
void in_if_link_down(struct ifnet *);
void in_if_up(struct ifnet *);
void in_if_down(struct ifnet *);
void in_if_link_state_change(struct ifnet *, int);
struct route;
struct ip_moptions;
struct in_ifaddr *in_selectsrc(struct sockaddr_in *,
struct route *, int, struct ip_moptions *, int *, struct psref *);
struct ip;
int in_tunnel_validate(const struct ip *, struct in_addr, struct in_addr);
#define in_hosteq(s,t) ((s).s_addr == (t).s_addr)
#define in_nullhost(x) ((x).s_addr == INADDR_ANY)
#define satosin(sa) ((struct sockaddr_in *)(sa))
#define satocsin(sa) ((const struct sockaddr_in *)(sa))
#define sintosa(sin) ((struct sockaddr *)(sin))
#define sintocsa(sin) ((const struct sockaddr *)(sin))
#define ifatoia(ifa) ((struct in_ifaddr *)(ifa))
int sockaddr_in_cmp(const struct sockaddr *, const struct sockaddr *);
const void *sockaddr_in_const_addr(const struct sockaddr *, socklen_t *);
void *sockaddr_in_addr(struct sockaddr *, socklen_t *);
static __inline void
sockaddr_in_init1(struct sockaddr_in *sin, const struct in_addr *addr,
in_port_t port)
{
sin->sin_port = port;
sin->sin_addr = *addr;
memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
}
static __inline void
sockaddr_in_init(struct sockaddr_in *sin, const struct in_addr *addr,
in_port_t port)
{
sin->sin_family = AF_INET;
sin->sin_len = sizeof(*sin);
sockaddr_in_init1(sin, addr, port);
}
static __inline struct sockaddr *
sockaddr_in_alloc(const struct in_addr *addr, in_port_t port, int flags)
{
struct sockaddr *sa;
sa = sockaddr_alloc(AF_INET, sizeof(struct sockaddr_in), flags);
if (sa == NULL)
return NULL;
sockaddr_in_init1(satosin(sa), addr, port);
return sa;
}
#endif /* _KERNEL */
#if defined(_KERNEL) || defined(_TEST)
int in_print(char *, size_t, const struct in_addr *);
#define IN_PRINT(b, a) (in_print((b), sizeof(b), a), (b))
int sin_print(char *, size_t, const void *);
#endif
#endif /* !_NETINET_IN_H_ */
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